Distinguishing two single-mode Gaussian states by homodyne detection: An information-theoretic approach
Academic Article
-
- Overview
-
- Research
-
- Identity
-
- Additional Document Info
-
- Other
-
- View All
-
Overview
abstract
-
It is known that quantum fidelity, as a measure of the closeness of two quantum states, is operationally equivalent to the minimal overlap of the probability distributions of the two states over all possible positive-operator-valued measures (POVM's); the POVM realizing the minimum is optimal. We consider the ability of homodyne detection to distinguish two single-mode Gaussian states and investigate to what extent it is optimal in this information-theoretic sense. We completely identify the conditions under which homodyne detection makes an optimal distinction between two single-mode Gaussian states of the same mean and show that, if the Gaussian states are pure, they are always optimally distinguished. © 2005 The American Physical Society.
published proceedings
author list (cited authors)
-
Nha, H., & Carmichael, H. J
citation count
complete list of authors
-
Nha, Hyunchul||Carmichael, HJ
publication date
publisher
published in
Research
Identity
Digital Object Identifier (DOI)
Additional Document Info
Other
URL
-
http://dx.doi.org/10.1103/PhysRevA.71.032336